The associated diatomaceous earth mining area in the Xianfeng large-size lignite ore district is the second largest diatomaceous earth mining area in China with high organic matter from 15% to 30%, belonging however to low-grade diatomite which has not been effectively utilized by traditional processes due to low economic value. This study aimed at utilizing high organics-bearing diatomite as waste resources and improving the comprehensive utilization proportion of mineral resources in the Xianfeng coal mining area. The diatomite with high organics was purified by acid washing and then calcined under N₂ as a protective atmosphere at high temperatures of 500 to 800℃. The organic matter was carbonized with the formation of amorphous activated carbon/diatomite compound materials. Electronic microscopy showed that the amorphous activated carbon was uniformly dispersed on the surface and interior pores to form a stable amorphous active carbon/diatomite compound material. The specific surface area and methylene blue adsorption test showed that carbon/diatomite had much higher performance than conventional diatomite products. The novel carbon/diatomite had specific surface area of 55.79 m²/g and methylene blue saturated adsorption capacity of 41.87 mg/g. The significantly saturated adsorption capacities of heavy metal ions were Pb²⁺ 54.47 mg/g, Co²⁺ 37.34 mg/g and Sr²⁺ 25.1 mg/g, respectively. The results show that the proposed technological processes are helpful to substantial improvement of economic values of Xianfeng diatomite, and hence has broad potential applications as a novel absorbent.